------------[ cut here ]------------ WARNING: CPU: 0 PID: 8168 at kernel/rcu/tree_stall.h:898 rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:890 Modules linked in: CPU: 0 PID: 8168 Comm: kworker/u4:6 Not tainted 5.15.0-rc3-next-20211001-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:rcu_check_gp_start_stall.part.0+0x325/0x4b0 kernel/rcu/tree_stall.h:898 Code: 0f 88 fa 00 00 00 be 04 00 00 00 48 c7 c7 40 77 26 90 e8 ee 9a 5a 00 b8 01 00 00 00 87 05 83 40 c4 0e 85 c0 0f 85 c9 00 00 00 <0f> 0b 48 81 fd c0 9f 98 8b 48 c7 c3 2c e1 6e 8d 74 58 48 b8 00 00 RSP: 0018:ffffc90000007e30 EFLAGS: 00010046 RAX: 0000000000000000 RBX: 00000001000247af RCX: ffffffff816236b2 RDX: fffffbfff204cee8 RSI: 0000000000000004 RDI: ffffffff90267740 RBP: ffffffff8b989fc0 R08: 0000000000000001 R09: 0000000000000003 R10: fffffbfff204cee8 R11: 0000000000000000 R12: 1ffffffff16c1e30 R13: 0000000000000246 R14: ffff8880b9c3a8d2 R15: 0000000000000008 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb11e359700 CR3: 000000000b68e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: rcu_check_gp_start_stall kernel/rcu/tree_stall.h:861 [inline] rcu_core+0x4df/0x1470 kernel/rcu/tree.c:2747 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline] RIP: 0010:check_preemption_disabled+0x1b/0x140 lib/smp_processor_id.c:16 Code: 0f 1f 44 00 00 0f 0b e9 23 ff ff ff cc cc cc 41 56 41 55 49 89 f5 41 54 55 48 89 fd 53 0f 1f 44 00 00 65 44 8b 25 cd bf ce 76 <65> 8b 1d 5e 1a cf 76 81 e3 ff ff ff 7f 31 ff 89 de 0f 1f 44 00 00 RSP: 0018:ffffc9000adc7a38 EFLAGS: 00000297 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff888021a15700 RSI: ffffffff89e44360 RDI: ffffffff89e443a0 RBP: ffffffff89e443a0 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff817e4182 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff89e44360 R14: ffffffff8b981260 R15: ffffc9000adc7b58 perf_trace_buf_alloc+0x98/0x260 kernel/trace/trace_event_perf.c:411 perf_trace_lock_acquire+0x180/0x550 include/trace/events/lock.h:13 trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x416/0x510 kernel/locking/lockdep.c:5608 rcu_lock_acquire include/linux/rcupdate.h:268 [inline] rcu_read_lock include/linux/rcupdate.h:694 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:410 [inline] batadv_nc_worker+0x12d/0xfa0 net/batman-adv/network-coding.c:721 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 5: 0f 0b ud2 7: e9 23 ff ff ff jmpq 0xffffff2f c: cc int3 d: cc int3 e: cc int3 f: 41 56 push %r14 11: 41 55 push %r13 13: 49 89 f5 mov %rsi,%r13 16: 41 54 push %r12 18: 55 push %rbp 19: 48 89 fd mov %rdi,%rbp 1c: 53 push %rbx 1d: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 22: 65 44 8b 25 cd bf ce mov %gs:0x76cebfcd(%rip),%r12d # 0x76cebff7 29: 76 * 2a: 65 8b 1d 5e 1a cf 76 mov %gs:0x76cf1a5e(%rip),%ebx # 0x76cf1a8f <-- trapping instruction 31: 81 e3 ff ff ff 7f and $0x7fffffff,%ebx 37: 31 ff xor %edi,%edi 39: 89 de mov %ebx,%esi 3b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)